Add upstream sync badge to README

Author: sky06walker

README.md

@@ -1,3 +1,5 @@
+[![Upstream Sync](https://github.com/sky06walker/KVideo/actions/workflows/Github_Upstream_Sync.yml/badge.svg)](https://github.com/sky06walker/KVideo/actions/workflows/Github_Upstream_Sync.yml)
+
 # 视频聚合平台 (KVideo)
 
 ![KVideo Banner](public/icon.png)
@@ -480,4 +482,4 @@ npm start
 
 ## Star History
 
-[![Star History Chart](https://api.star-history.com/svg?repos=KuekHaoYang/KVideo&type=date&legend=top-left)](https://www.star-history.com/#KuekHaoYang/KVideo&type=date&legend=top-left)
+[![Star History Chart](https://api.star-history.com/svg?repos=KuekHaoYang/KVideo&type=date&legend=top-left)](https://www.star-history.com/#KuekHaoYang/KVideo&type=date&legend=top-left)